I thought I'd make a post of useful links that I use frequently so they can all be in one place.

Can Admin please make this sticky and please add your suggestions for other links.
If possible can these be added to the first post?

Here are a few to get the ball rolling:

LED Resistor Calculator;
http://led.linear1.org/1led.wiz

Timing Pulley Calculator:
http://www.sdp-si.com/cd/default.htm

Drill Hacking Guide:
http://www.robowars.org/guides/guides-d ... cking.html

Pneumatic Systems Information:
http://www.teamonslaught.fsnet.co.uk/co2_info.htm

Pneumatic System Build Tips:
http://www.teamdavinci.com/understanding_pneumatics.htm

Spinning Weapon KE Calculator:
http://www.teamcosmos.com/ke/ke.shtml